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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/102350] __builtin_source_location not available in earlier
 language modes
Date: Wed, 15 Sep 2021 16:39:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102350

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
__builtin_source_location doesn't require -std=3Dc++20, but indeed does req=
uire
<source_location> or some compatible definition of std::source_location::__=
impl
class, and as it doesn't have hardcoded layout of that structure but instead
matches whatever the source header provides (looks up fields it needs in th=
ere
and uses whatever types and layout they have), there is no way around that.
Of course, without -std=3Dc++20 the usefulness of it is limited because it =
relies
on consteval that is only supported in C++20 or later.=